CERN Accelerating science

ATLAS Slides
Report number	ATL-PHYS-SLIDE-2010-224
Title	J/psi -> mumu from 7 TeV pp collisions in ATLAS: physics with the first data
Author(s)	Nelson, A (Iowa State University)
Corporate author(s)	The ATLAS collaboration
Submitted to	35th International Conference on High Energy Physics, Paris, France, 22 - 28 Jul 2010
Submitted by	andrew.james.nelson@cern.ch on 03 Aug 2010
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	BPHYS
Abstract	ATLAS has a rich charmonium and beauty physics programme. After a few pb-1 of 7 TeV collision data have been taken at the LHC, ATLAS will be able to start probing the new energy regime with decays of the psi and Upsilon families of mesons into pairs of muons. The very first physics measurement, possible with less than 1 pb-1 of data, is the fraction of J/psi mesons produced in B-hadron decays. We present preliminary results for this measurement, and discuss issues surrounding the measurement of the differential cross section and J/psi polarization.